Know any 13 to 17-year olds who are trying out their hands at code? They can also get involved in the Google Code-In contest and win cool prizes while at it. The Google Code-in 2013 contest runs from November 18, 2013 to January 6, 2014.
Google Code-In is designed to (1) encourage and inspire pre-university students to begin participating in open source development, (2) help open source projects identify and bring in new contributors, and (3) provide pre-university students interested in computer science and other fields with exposure to real-world software development, including coding work, documentation and open source community involvement.
The FAQs should answer all the questions you might have.
You can also read up more on how to get involved by visiting this link.